Disclosed herein are methods for treating patients that may develop or already have pre-existing gene therapy neutralizing antibodies by administering a protease that cleaves peptide bonds present in immunoglobulins or by administering a glycosidase that cleaves carbohydrate residues present on immunoglobulins, or other similar enzymatic cleavage of immunoglobulins in vivo. Also disclosed are methods for utilizing IdeS and other immunoglobulin G-degrading enzyme polypeptides for gene therapy treatment of a disease in a patient in need thereof.

Disclosed herein, in one aspect, is a method of reducing immunogenicity, comprising administering to a patient receiving or having received a biological therapeutic agent, an effective amount of B cell inhibitor that is non-depletional. Related compositions are also provided.

Disclosed herein, in one aspect, is a method of reducing immunogenicity, comprising administering to a patient receiving or having received a biological therapeutic agent, an effective amount of B cell inhibitor that is non-depletional. Related compositions are also provided.

The present invention relates to a novel polypeptide which displays IgG cysteine protease activity, and in vivo and ex vivo uses thereof. Uses of the polypeptide include methods for the prevention or treatment of diseases and conditions mediated by IgG, and methods for the analysis of IgG.

Provided herein are proteases that can be capable of cleaving immunoglobulins, including immunoglobulin G in a subject, which can be a canine. Also provided herein are methods of administering a protease provided herein to a subject, which can be a canine.

This disclosure is based, at least in part, on an unexpected discovery that the novel nanobodies and variants thereof are able to specifically bind afucosylated or sialylated IgG Fc glycoforms. Glycosylation of the IgG Fc domain is a major determinant of the strength and specificity of antibody effector functions, modulating the binding interactions of the Fc with the diverse family of Fc? receptors. These Fc glycan modifications, such as removal of the core fucose residue, are newfound clinical markers for predicting severity of diseases, such as diseases caused by dengue virus (DENV) or SARS-CoV-2. However, it remains challenging to accurately distinguish specific IgG glycoforms without costly and time-intensive methods. The novel glycol-specific nanobodies and variants thereof, as disclosed herein, can be used as rapid clinical diagnostics or prognostics to risk stratify patients with viral and inflammatory diseases.

Compositions and methods for identifying glucuronylated protein drug products are provided.

This invention relates to methods and compositions for inhibiting or depleting antibodies, e.g., total IgG including neutralizing antibodies. In particular, the invention relates to methods of inhibiting or depleting antibodies against a heterologous agent when the heterologous agent is administered to a subject, comprising administering to the subject an effective amount of recombinant or modified Streptococcus pyogenes IgG degrading enzyme (IdeS) prepared from codon-optimized nucleic acids and/or modified nucleic acids, thereby inhibiting or depleting antibodies and inhibiting neutralization of the heterologous agent, e.g., to improve viral vector-mediated gene therapy.

The present invention pertains to a vaccine comprising in combination an IgM protease antigen of Streptococcus suis serotype 1, a Streptococcus suis bacterin serotype 9, sequence type 16, and a pharmaceutically acceptable carrier, The invention also pertains to a combination of an IgM protease antigen of Streptococcus suis serotype 1, and a Streptococcus suis bacterin serotype 9, sequence type 16, for use in a method to protect a pig against a pathogenic infection with Streptococcus suis and to a method for protecting pigs against a pathogenic infection with Streptococcus suis, by administering to the pigs an IgM protease antigen of Streptococcus suis serotype 1 and a Streptococcus suis bacterin serotype 9, sequence type 16.

The present invention relates to a novel polypeptide which displays IgG cysteine protease activity, and in vivo and ex vivo uses thereof. Uses of the polypeptide include methods for the prevention or treatment of diseases and conditions mediated by IgG, and methods for the analysis of IgG.